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PORTLAND, Ore. (AP) -- A prosecutor says he has yet to decide whether to file criminal charges in connection with a fatal bus crash on Interstate 84 in Eastern Oregon.

Umatilla County District Attorney Dan Primus called the case very complex and said he has not convened a grand jury.

Background: Nine killed in Oregon charter bus crash

Nine people died and almost 40 were injured Dec. 30 when a bus carrying tourists smashed through a guardrail east of Pendleton and rolled down a hill.

The U.S. government quickly banned Mi Joo Tour & Travel from operating buses on U.S. roads. Federal officials found the driver was on duty for 92 hours in the eight-day stretch before the crash, exceeding federal limits.

Attorneys for the Canadian company said black ice -- not driver fatigue or excessive speed -- caused the crash.

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